如何在Ruby中将binary32转换为浮点数

Question

我有一个在IEEE 32中以二进制32编码的数值。

如何将0x0040EDC2转换为-118.625？

我尝试过多种打包和解包的选项，但都没有成功。

IEEE : http://en.wikipedia.org/wiki/Single-precision_floating-point_format Manu

- manusvs650

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你尝试了哪些“pack”参数？它们失败在哪里了？ - sarnold

Answer 1

$ irb
irb(main):001:0> bin = "\x00\x40\xED\xC2"
=> "\000@\355\302"
irb(main):002:0> bin.unpack 'f'
=> [-118.625]
irb(main):003:0> bin.unpack 'e'
=> [-118.625]
irb(main):004:0> bin.unpack 'F'
=> [-118.625]
irb(main):005:0> i = 0x0040edc2
=> 4255170
irb(main):006:0> bin = [i].pack('L')
=> "\xC2\xED@\x00"
irb(main):007:0> bin.unpack 'g'
=> [-118.625]
irb(main):008:0> RUBY_PLATFORM
=> "x86_64-linux"
irb(main):009:0> RUBY_VERSION
=> "1.9.2"

- dbenhur